Plastic extrusion molding press



Feb. 1, 1938. v. s. SHAW I PLASTIC EXTRUSION MOIJDING PRESS Filed May l5, 1936 vlcToR asfmw,

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Feb. 1, 1938. v. s. SHAW PLASTIC EXTRUSION MLDIQNG PRESS Filed May 15, 1936 12 Sheets-Sheet 2 VICTOR S. SHAW,

Feb.rl, 1938.v v. s. sHAw PLASTIC EXTRUSION MOLDING PRESS l Tr-fvwm VICTOR S. 5 HA VV,

Feb. 1, 1938. v. s. SHAW PLASTIC EXTRUSION MOLDING PRESS Filed My 15,

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Feb. l, 1938. v. s. SHAW v I PLASTIC EXTRUSION MOLDING PRESS Filed May 15', 1956 l2 Sheets-Sheet 6 FIGr.6.

Feb. l, 1938. v. s. SHAW PLASTIC EXTRUSION MOLDING PRESS 12 She'etS-Shee'f. 7

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Feb. 1, 1938. v. s. sHAw PLASTIC ExTRUsIoN MOLDING PRESSl l2 Sheets-Sheet 8 Filed May l5, 1936 FCLS.

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PLASTIC EXTRUSION MOLDING PRESS Filed May l5, 19736 l2 Sheets-Sheet 9 141 154 a 15o M I 62 I m A 159160 "q I 15a, 7 i 14312 16 ik' -J 1 J l 54163 ,52 l5, [47 [40 n .l t l l 2 [79 \\l t\\\\\ \A VICTOR 5.5HAVV,

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PLASTIC EXTRUSION MOLDING PRESS Filed May 15, 1936 l2 SheetS-"Sheel lO f1/umm', vieron :.sHAw,

Feb. l, 1938. l V. s, SHAW 2,107,190

l PLAsTcv EXTRUSION MOLDING PRESS Filed May 15, 1956 12 Shets-sheef. 11

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Feb. 1, 1938.4 v, s SHAW `2i,l07,190

PLASTIC EXTRUSION MOLDING PRESS Filed May 15, 193e 12 sheets-shef. 12

wcToR S.SHAW,

N Y UNITED STATES 2,107,190 ruis'rlcnx'rausion Momma mss S. Shaw, Cardlngton. Ohio, asignar to The Hydraulicrlrese Oorporation. mingtom Del., a corporation of Delaware Y Inc.,v Wil- 'Application May V1s, 193s, semi No. '19,054

` 412 Claims.

Y This invention relates to lnjectiomor extrusion presses, and especially'to extrusion presses for molding thermoplastic materials 4like cellulose acetate, which can be re-softened and re-molded by heat after cooling, as contrasted with mate- 'rials like phenol resins which acquire a permanent set upon cooling.

One object of this invention is to provide an extrusionpress having die members movable into engagement with an injector, anda charging and feeding arrangement for supplying measured quantities of materials to the press.

Another object is to provide a *hydraulic circuit including s'uch a press and charging and feeding arrangement, in combination with pumps Vfor operating the hydraulic plungers, which move the dies and injector into engagement with onev another, and which also operate the charging and feeding mechanism.

Another object is to provide such' la press wherein the charging arrangement is operatively connected to the feeding arrangement so that the former distributes measured charges to the latter in proportion to the quantity required by thelatter. ,v

Another object is to provide a charging and feeding arrangement having means for heating the thermoplastic materials'during the charging and feeding operations,l together with means for varying the temperatures applied to different portions of the press, although the heat is supplied from' a common source.

Another object is to provide a, heating arrangement for applying different degrees to ldifferent parts o1' a machine, lthis heating arrangement consisting of means for heating a iiuid and distributing this iluld to diierent partsv of the machine, together with a by-passing arrangement for by-passing a portion of the iluid past a cer- .tain part of the machine so as to lower the temperature of the portion which is lay-passed. l

Another object is to provide a hydraulic extrusion press having independent sources of supplying pressure iluid to the die clamping cylinders and to the injection or extrusion cylinders so that the clamping pressure may be maintained at a different pressure level from the injection or .extrusion pressure or be kept `independent thereof. 'f

In the drawings:

lFigure 1 is a iront elevation of the injection or extrusion molding press of this invention.

Figure 2 is a view of the press shown in Figure 1, with the upper portion in vertical section through the axis of the clamping plunger, and

REissuio Figure 4. is a left-hand (end elevation of the press. Figure 5 is a right-hand' end elevation of the pleSS.

Figure 6 is van enlarged view of a portion oi Figure 5 with portions of the casing removed to show the interior mechanism, on the line l-. of Figure 2.

VFigurey 7 is a central vertical section through the charging, heating and feeding arrangement of the press.

Figure 8 is adetail view`of the mechanism in-l terconnecting and synchronizing the injecting mechanism with the charging mechanism.

Figure 9 is a view of the mechanism shown in Figure 8, but partly in section, in a plane at right angles to the view shown in Figure 8.

Figure V1i) is an enlarged sectional view of the mechanism shown at the left-hand side of Figure 9.

v Figui-all is'a diagrammatic sectional view of the press audits hydraulic circuit, with the various plungers in a retracted position.

Figure 12 is a view similar to Figure 11, but with thefdie members moved into engagement with the injector, and with the injection operation about to take place.

lFigure 13 is a view similar to Figures control levers after the injection operation has taken place.

Figure 14 isS a plan view Voi' the extreme lefthand portion of Figure 7, showing the exterior appearance oi the injecting and charging devices.

Figure 15 is an elevational view of the supporting structure for the mechanism shown in Figure 8. y

General arrangement and hydraulic circuit 1l and w12, but showing the positions of the parts and Cil and is fitted with a pressure and volume control hand wheel I6. This control acts upon the variable stroke mechanism of the pump I3 in such a manner as to give a lull volume delivery of pressure iluid at working pressures, the arrangement reducing the output to zero at a predetermined vmaximum or peak pressure. This control is also known to those skilled in the art, and its details also form no part of the present invention.

The pumps i2 and I3 are driven from the motor |4 through the shafts l1 and I8, respectively, (Figure 2 'I'he pump I2 receives iiuid through the suction line |9, running from it to the tank il, and discharges pressure fluid into the line 20, running to the injection. control valve 2|. The branch line 22 continues onward from the pressure line 20, and distributes pressure fluid through the check valve 23 and the line 22a to the pistons supporting one of the die members, as hereinafter explained.

From the ports 24 and 25 of the injection control valve 2| the lines 26 and 21 run, respectively, to the opposite sides of the injection piston of the press, as hereinafter explained. From' the end ports 28 and 28 the line 30 discharges into the iiuid tank Il. The injection control valve 2| contains a valve member 3|, having valve heads 32 and 33, these being shifted bodily by means of the crank arm 34 operated by the injection control valve hand lever 35.- As the hand lever 35 is moved tn ,and fro the valve heads 32 and 33 are moved upwardly or downwardly within the valve 2| so as tov distribute fluid either to the line 26 orto the line 21, 'as desired.

The hydraulic pump 3 receives iluid from the tank by way of the suction line 40, and dis charges pressure fluid through the line 4| leading to the clamping control valve 42 (Figures 2 and 11). The line 4| is likewise connected to the branch line 22a between the check valve 23 and the press. The check valve 23 prevents the return flow of fluid .toward the pump |2 when the pump I3 is operating, but when the pump |2 is in a non-delivery position. From the ports 43 and 44 ofy the clamping control valve 42 the lines 45 and 46 lead, respectively, to the opposite sides of the clamping plunger of the extrusionpress, as hereinafter explained. From the line 45 the branch line 41 carries fluid to one side of the charging plunger of the press, the opposite side of which is connected by the branch line 48 to the line 46, as hereinafter explained. 'I'he clamping control valve 42 likewise contains a valve member 49, having spaced valve heads 50 and 5| arranged tobe moved to and fro by the;

clamping piston 61.

Extrusion molding press construction The extrusion molding press parts are mounted upon the base l0 (Figures 1 and 2), and are arranged upon the top memberl thereof. The

clamping cylinder assembly 6| is mounted upon 5 the left-hand side of the base top member 60, the injecting cylinder assembly 62 is mounted upon the right-hand end thereof, and the cushioning plunger assembly 63 is arranged between l the assemblies 6| and 62,` these being interconnected by the strain rods secured` thereto by the nuts 65 (Figure 1l) threaded upon the ends of the strain rods 64.

The clamping cylinder assembly 6| consists of the cylinder bore 66, having the clamping pistonY 61 with the piston head 68 reciprocable therein. At one end of the cylinder -bore 66 the port 63 is connected to the line 45 leading to the clamping control valve 42. On the opposite side of the piston head 68 is situated the port 1|I, connected to the line 46, likewise leading to the clamping control valve 42. The packing 1|, compressed by the gland 12 through the agency of the cap screws 13, prevents leakage from around the 'Ihe opposite end of the clamping piston 61 from thel clamping piston head 68 has a reduced diameter portion 14, upon which is mounted the die head 15 having the bore 16 arranged to receive the reduced diameter por- 30 tion 14. The outer ends of the die head 15 are provided with bores 11 containing bushings. 18 surrounding and engaging the strain rods 64 (Figure 11) so as to provide a sliding engage` ment.

35 The die head 15 is also provided with drilledof the threaded-stops 86, these being mounted .in 45 the threaded bores 8.1 of the clamping cylinder assembly 6|, and locked in position'by means of the locknuts 88 (Figure 11). The purpose of the knock-out rod 83 and knock-out pin 84 is to eject the molded piece from the die member 8| when the rod 83 is 'carried back into contact with the ends of the threaded stops 86 on the return motion of the clamping plunger 61.

The injecting cylinder assembly 62 consists of the cylinder bore 89, containing thev piston rod 90 having the piston head 8| securedat, one end, and the injector plunger 32 mounted`upon the other end (Figure 11). 'Ihe cylinder b ore 69 is provided with ports 83 and 84 at its opposite ends, respectively connected by the lines 26 and 60 between the enlargements |11 thereof and the 65 spacing bushings 98 engaging the injecting cylinder assembly 62, is the cross-piece 89. This crosspiece contains the cushioning cylinder bores |00, having the ports I0| connected by the lines 22a and 22 to the control valves 2| and 42, respec- 7 tively.

Mounted to reciprocate in the cylinder bores |00 are the piston heads |02 connected' to the piston rods |03, the opposite ends of which are secured, as at |04, to the crosshead |05. The

inl

leakage of fluid around the piston rods |03 is prevented bymeans of the packings |06, arranged to be compressed by the glands |01. The crosshead |05 is provided with bores |09 containing bushings |03 adapted to provide sliding engagement with the strain rods 64, the latter having annular enlargements I serving as stops to limit the forward movement of the crosshead Mounted upon the crosshead and secured thereto, as by the bolts passing through the holes ||2l is the die member ||3, cooperating with the previously-mentioned die member' 3|. The die member ||3 is provided with a die recess ||4 aligned with the recess I|5 in the die member 3|. Access to these recesses ||4 and ||5 is provided 'by means of the passageway ||6 extending rearwardly through the die member ||3, and terminating in the mouth ||1 (Figure ll).

Secured to the cross-piece 99, as by the bolts ||9 running through the bolt holes 9, is the injector cylinder |20, within the bore |2| of which the injector plunger 92 operates. The injector cylinder is provided with a nozzle or nose portion |22, the tip of which is adapted to fit snugly within the mouth ||1 of the passageway ||6 in the die member ||3 when the latter is moved into engagement therewith, as hereinafter described.

The injector cylinder |20 is surrounded by a casing |23, providing a chamber for the circulation of heating fluid for maintaining the molding material in a plastic condition, as hereinafter explained. Projecting laterally from the injector cylinder |20 is a charging cylinder |24, similarly surrounded by a casing for providing a chamber 'for the circulation ofheating iiuid therebetween. The charging cylinder |24 is provided with a bore |26, within which the charging plunger |21 is arranged to reciprocate. On the oposite end of the charging plunger |21 is mounted the piston head |26, arranged to reciprocate within the cylinder |29. The opposite ends of the cylinder |29 are provided with ports |30 and |3|, connected respectively to the lines 41 and 43, previously described (Figure 11).

Material-measuring and charging arrangement 'I'he material-measuring and charging devices are mounted upon a' hollow base |32, extending rearwardly approximately at right angles to the main portion of the press (Figure '1). The cylin- 'der |29, containing the piston head |26 for operating the charging plunger |21, is supported by the bracket |33 mounted upon the top portion |34 of the base |32. The charging cylinder bore |26 is aligned with a bore |35 (Figure '1), having an aperture |36 in one side thereof. aperture |36 is arranged a funnel member |31, adapted to direct materials through the aperture |36 into the bores |35 and |26.

'Ihe cylinder |29 is provided witha projection |33, this projection on the upper side of the cylinder |29 being adapted to support the charge-V measuxing assembly, generally designated |39. The latter consists of a casing |40, having a conical upwardly extending portion |4I and a horizontal cylindrical bore |42 connected therewith by the vertical passage way |43. The conical portion |4| is provided with an interior conical surface |44 adapted to receive the conical lower portion of a hopper |45. 'Ihe outer end of the bore |42 is conected to the funnel |31, so as to discharge into this funnel. Arranged to rotate within the bore |42 is a material-moving screw Above this conveyor |46, mounted upon the shaft 41 (Figures 9 and l0), the latter being journalled in the' anti-friction bearings |48 and |49, the latter being supported by the bracket |50 extending rearwardly from the casing |40. Surrounding the shaft |41 is a downwardly depending bracket |5|, arranged to support the guide rollers |52 secured thereto, as by the cap screws |53 (Figures 8 and 10). The outer end of the shaft |41 terminates in a threaded portion |54 having the retaining4 nut |55 mounted thereon.

Surrounding 'the shaft 41 for free rotation thereon is the sleeve |56, containing the teeth of the gear portion |51 and having mounted thereon the disc |58, carrying the stub shaft |59 upon which is mounted the ratchet pawl |60. The latter is arranged to engage the ratchet wheel |6|,

which is secured by the key |62 to the shaft |41.

Supported by the .guide rollers |52 and arranged to engage the teeth of the gear portion |51, is a rack |63 (Figure 8), one end of which is pivotally mounted upon the pin |64 secured to the split collar |95. The latter is clamped to the arm |66 by means of the bolt |61. The inner end of the arm |66 is secured within the bore |69 in the crank arm |69 mounted upon the end of the shaft |10, and held in position by the nut |1| upon the threaded portion |12 thereof (Figures 8 and 9.) The shaft |10 is supported in anti-friction bearings |13, |14 and |15. The bearings |13 are mounted in a bracket |16 secured to the bracket |33. 'I'he anti-friction bearings |14 and- |15, however, are mounted in a bracket |11, the lower portion of which rests upon the top member 60 of the main base |0 of the press.

Mounted upon the oposite end of the shaft |10 from 'the crank arm |69 is a bifurcated arm |10 (Figure 9), the outer ends of which are pivotally connected, as at |90,to links |19 (Figure 2). The opposite ends of the links |19 are pivotally connected. as at IBI, to a collar |82 mounted upon the piston rod 90. Consequently, the reciprocation of the piston rod 90 and the injector plunger 92 will cause the bifurcated arm |19 to rotate the shaft |10, and move the arm |66 and the rack |63 to and fro by amounts directly proportional to the motion of the piston rod 90. As the rack |63 moves to the left (Figure 8) it will rotate the gear |51, and with it the disc |58, but the pawl |60 will slip loosely over the ratchet wheel |6| without engagement therebetween. Consequently, no rotation is imparted to the shaft |41 during the return motion of the injector plunger 92 and its position rod 90. During the injection stroke thereof, however, the gear |51 and disc |59 will be rotated in the opposite direction by the motion of the rack |63 to the right (Figure 8), whereupon the pawl |60 (Figure 10) will operatively engage the ratchet wheel |6| and rotate the shaft |41. 'Ihe rotation of the shaft |41 and screw conveyor |46 will cause material placed in the hopper |45 to move to the right (Figure 9), and be expelled into the funnel |31 and thence through the aperture |36, into the charging cylinder bores and |26. The charging then takes place by the action of the charging plunger 21 as impelled by the piston head |29, in a manner subsequently to be described.

Heating arrangement for maintaining materials in plastic condition The molding material is maintained ina plastic condition by the circulation of heated oil around the various chambers through which the material passes. The oli is contained in a reservoir |83 mounted within the base |32 and heated by means o! an electrical heating unit |84, which is connected by the lines |85 and |88 (Figure '1) to the indicating thermostat |81 (Figure 1). The oil is circulated from the reservoir |83, throughout the various chambers, by means of a pump |88 driven by the motor |88. The uid is drawn from the reservoir |83, through the passageway |88 and the line I8|, into the pump |88, from which it is expelled through the line 82, into the chamber between the injector cylinder |28 and its surrounding casing |23 (Figures 7 and 11). From this chamber the oil ows through the pipe |83 and valve |84, intothe chamber between the charging cylinder I 24 and its surrounding casing |25. The oil then iiows from the opposite end of the chamber, through the lines |85 and |88 into the reservoir |83. The line |83 is connected to the line |88 by the bypass line |81, containing the by-pass valve |98.

The oil in the reservoir |83 is'heated by the heating unit |84 in response to the control of the thermostat |81. The heated oil, in passing through the passageway |88 on its way to the pump |88. surrounds the bulb |88, which is connected by the conduit 288 to the thermostat |81 so that the thermostat responds to the temperature of the oil surrounding the bulb |88 and imparts its control to the electrical heating unit |84 through the lines |85 and I 88 leading thereto. The heated oil reaches the reservoir |83 from an ante chamber 28|, access to which is obtained through the filling connection 282 (Figure 7).

The indicating thermostat |81 is mounted in a convenient location upon the front of the press; as shown in Figure 1. Also mounted in similar locations are the pressure gauges 283 and 284, arranged to indicate the pressure existing in the injecting and clamping circuits, respectively. The hand wheels |5 and I8 for controlling the pumps |2 and |3 and the hand levers 35 and 53 also project from the front apron of the press base, where they may be conveniently manipulated by the operator.

Operation Before operating the press the various plungers are placed in retracted positions by shifting the control valve hand levers 35 and 53 away from one another, as shown in Figure 11. The pumps 28, into the bore of the valve 2|, thence through the port 25, the line 21 and the port 84, into the space to the left of the piston head 8| within the injection cylinder bore 88, forcing the piston head 8| to the right and retracting the injector plunger 82. At the same time iiuid iiows from the line 28, through the branch line 22, the check valve 23, the line 22a and the ports |8|, into the cushioning cylinders |88, where this fluid acts against the piston heads |82 to force the crosshead 83 and die member II3 to the left.

Meanwhile, the fluid expelled from the opposite end of the injection piston cylinder 88 returns to the tank II by way of the port 83, the

line 28, the-valve ports 24 and 28 and the line V38. During this time the pump I3 discharges pressure iiuid through the line 4|-, into the clamping control valve 42, thence through'the port 44 and the line 48, into the space to the right of the clamping piston head 88, forcing the die member the piston head to the left and with it the die member 8|. The pressure iiuid also continues from the line 48, through the line 48 and the port |3I, into the cylinder I 28, where it acts against the piston |28 to move the charging plunger |21 into its retracted position. The fluid expelled from the opposite sides o! the piston heads |28 and 88 passes through the lines 41 and 45, the port 43 of the control valve 42, and the port 54 and line 58, into the tank To place the clamping plunger and dies in engagement with one another and with the Injector. the hand lever 53 is moved to the right into the position shown in Figure 12. In this position the pressure iuid flows from the control valve 42, through the line 45, into the space to the left of the clamping piston head 88, forcing the latter inwardly until the die member 8| engages the die member II3. When this occurs the die member |I3 is forced rearwardly until its mouth ||1 comes into engagement with the nose |22 of the injector. The impact is cushioned by the gradual yielding of the cushioning piston heads |82 in the face of the superior thrust o1' the clamping plunger 81.

While this is occurring pressure uid passes from the line 45, along the line 41 and through the port |38, into the cylinder |28 (Figure 11) where it acts against the piston head |28, forcing it :ln-v wardly and directing a charge of the molding material into the injector 'cylinder |28. The parts have now arrived in the positions shown in Figure 1 2, with the two die members 8| and I I3 in engagement with one another and with the injector. To lcause the injector plunger 82 to force the plastic material into the space beween the molds, the hand lever 351s now moved to the left until it occupies the position shown in Figure 13. Under these conditions pressure iiuid now passes from the injector control valve 2|, through the line 28 and the port 83, into the space to the right of theinjector piston head 8|, causing the piston head 8 I, the piston rod 88 and the injector plunger 82 to move to the left, forcing a charge of the plastic material through the passageway I |8 into the recesses I4 and I|5 in the die members. Meanwhile, the material has been maintained in a plastic condition by reason of the circulation of the heated oil from the reservoir |83 through 'the lines previously described, and through the chambers surrounding the charging cylinder |24 and injector cylinder |28.

When the molding operation is completed the hand levers 35 and 53 are moved away from one another into the position shown in Figure 11, whereupon the various plungers are retracted, in the manner previously to their original positions. As the die member 8| near's'its retracted position the ends of the knockout rod 83 engage the ends of the threaded stop members 88, bringing the rodto a halt, while 8| continues its motion to the left (Figure 11). This causes the knock-out pin 84 to push the molded article out of the recesses 18 of the die member 8| expelling the article and Acausing it to drop into the chute 285 (Figure 3), whence it emerges through the mouth 288 thereofv (Figure 1) and falls into any suitable container. i

When the advance lof tire injector piston rod 88 occurs it moves the collar |82 forwardly and causes the rack |83 to bring about a rotation of the screw conveyor |48, in the manner previously described in connection with the construction thereof. A measuredl cha'fge of the plastic described, and returned the III and the conveyor l, due to theslippase of the pawl Il l overtheratchet wheel'lil.

l ing unit I'to maintaintheoilwithintheifeservoir |03 at a is pieten closed the` neared on wm pass through-1 the marinus chambers and make a complete cirtween the chamber surrounding the charging cylinder and that surrounding the injection cylinder, the by-pass valve Ill 'is partially opened so that a portion' of the fluid flows through the by-pass line Ill back to the reservoir |83 without passing through the chamber surround-- to perform the functions both of clamping and of extrusion or injection, assisted in some instances, by a ash pressure device or by check valves to trap the high pressure oil in the clamping cylinder while the high pressure pump actuated the extrusion or injection plunger. Where a second pump was employed it\was merely a large volume, low pressure pump, serving solely to rapidly traverse the clamping plunger in order to close the dies. Y Y

In the present invention it will be seen that I have provided'separate high pressure pumps,

. each with its own automatic pressure control, to

I supply pressure i'iuid separately tothe clamping plungers and extrusion or injection plunger. InA

this manner it is possible to run the extrusion or injection pressure at a lower level than the clamping pressure, and such a feature has been 50 found valuable in the practical operation of such presses. In. this connection. it is apparent that the die area which the press will handle is directly proportions] to the clamping pressure and inversely proportional tothe extrusion pressure.

55 It is therefore sometimes desirable lto run the clamping pressure up to the maximum and keep the extrusion pressure as low as is practical with the material being handled.

In the present invention the high pressure pump I! is of relatively large capacity and is so connected in the circuit that it serves the function `of rapidly traversing the clamping'plunger and' also the feeding plunger on both their forward land return strokes, thus serving the purpose. of an additional low pressure booster pump. During theextrusion or injection stroke both the clamping and feeding plungers are at rest, with their pressure being held at these points by the small high pressure pump I3, and during this forward extrusion stroke the extrusion or injection is carried out solely by the large high pressure pump i3. This pump l2 enables the elimination o ilashpressure devices previously used. v

It will be understood that I desireto comprehend withimmy invention fsuch modications.

llintothebore lwheuceitisim-Y Iluponthe't 1' VIclaimasnewanddeslretcsecurebyyLetters "creanme,

. Y s as come within thel scope of the claims andthe invention.

Having thus fully described my invention, what PatentJs:4j .A Y

. l.Y In combination, movable die means, devices for moving said die means into a closed position, an injector adapted to inject molding ma.- The thermostat l" controls the electrical heat- Y terial into said die means, and mechanism automatically responsive to and synchronized with the l0 Y operation of said injector for measuring out and.

distributing measured charges of moldingmaterial to said injector.

2. In combination, movable die means, devices formoying said die means into a closed position, 15 *y 5 an injector adapted to inject molding material into said dieA means, and'mecha'nism automating 'material to a machine with a material inject. 25

ing element comprising a charging chamber, a

-charging member therein, a measuringv casing communicating therewith, a measuring member within said casing adapted when moved to measure out and feed a predetermined charge of ma- 30 terial, and means automatically responsive to the operation of ,the material injectingV element of said machine for actuating said measuring member to measure out and feed a predetermined charge of material to said charging chamber.

4. A measuring and charging device for supply- Y ing material to a. machine with a material inject-V ing element comprising a charging chamber. a charging member therein, a measuring casing, a screw conveyor member therein adapted when 40 rotated to measure out and feed a predetermined charge of material, and means responsive to the motion of the material injecting element of said machine for rotating said screw Vconveyor to measure out and feed a predetermined charge of 45 material to said charging chamber.

5. A measuring and charging device for supplying material to a machine with a material injecting element comprising a charging'chamber, a charging member therein, a measuring casing, a 50 screw conveyor member therein adapted when rotated to measure out and feed a predetermined charge ofmaterial, a gear on said conveyor, a rack engaging said gear, and means responsive to the motion of the material injecting element of 56 said machine for moving said rack to loperate said conveyor to measure out and feed a prede- "termined charge of material tosaid charging chamber.

6. A rmeasuring and charging device for sup- 60 plying material to a machine with amaterial injecting element comprising a charging chamber, a

charging member therein, a measuring casing, a screw conveyor member therein adapted when rotated to measure out and leed a predetermined 65 4 rack and said conveyor and adaptedl to opera-te said conveyor by the motion in one direction only nsl '1. In combination, a pair of mutually engageable die members. a molding material injector therei'or, hydraulic plungers i'or moving said die members into engagement with each other and with said injector, a hydraulic plunger for operating said injector, and measuring means synchronized with the motion ot said injector plunger to measuf out and supply measured charges oi.

molding material to `said injector. Y 8. An apparatus for treating heated materi comprising a machine having a plurality of material-treating chambers, a fluid container, iiuid compartments adjacent said chambers for exchanging heat therewith, means for circulating the uid from said container through said compartments, means for heating said iiuid, and means for by-passing a portion of the fluid past one of said 'compartments whereby to establish a temperature diilerential between said charn-v bers. v

9. An apparatus for treating heated materials comprising a machine having a plurality of maf terial-treating chambers, a uid container.' duid vcompartments adjacent said chambers for exchanging heat therewith, means for circulating tially constant temperature, in said iiuid contemer.

l0. An apparatus for treating heated materials comprising a machine having a plurality of material-treatingchambers, a iiuid container, fluid compartments adjacent said chambers for exchanging heat therewith, means for circulating the iiuid from said container through said compartments, means for heating said iluid, means for by-passing a portion of the duid past one of said compartments whereby to establish a temperature differential between said chambers, thermostatic means for maintaining a substantially constant temperature in said fluid container, and a valve in said by-passing means for controlling the proportionate quantity of iluid by-passed. Y

" ll. An injection molding press circuit comprising a plurality oi' dies, a,v hydraulic clamping plunger for said dies, a molding material injection member, an injection plunger therefor, and independent means for separately supplying pressure uid to said clamping plunger and said injection plunger, said last named means including mechanism for actuating said clamping die plunger at a higher pressure than said injection plunger. Y

. 12. An injection molding press circuit comprising a plurality of dies, a hydraulic clamping `plunger for said dies, a. molding material injection member,L an injection plunger therefor, a variable delivery pump for supplying pressure iluid to said clamping plunger, means responsive to the attainment cf a predetermined pressure in the clamping circuit for shiftingsaid pump to its neutral delivery position, a second Variable delivery pump for supplying pressure iluid to said injection plunger, and means responsive to the attainment of al predetermined pressure i the injection circuit for shifting said second pump to its neutral deliveryposition, said last named means including mechanism for actuating said clamping die plunger at a higher pressure than said injection plunger.

VICTOR S. SHAW.

DISCLAIMER 2,107,l90.-Victo'r S. Shaw, Cai'dington, Ohio. PLASTIC EXTRUSION MOLDING PRESS.

Patent dated February l, 1938.

Disclaimer led February 25,

1939, by the assignee, TherHydrauLc Press Corporation, Inc.; the patentee 'joining and concurring.

Hereby enters this disclaimer to claims l, 2, and 3 of said Letters Patent.

` {Ojcial Gazette March 21, 1939.]

'1. In combination, a pair of mutually engageable die members. a molding material injector therei'or, hydraulic plungers i'or moving said die members into engagement with each other and with said injector, a hydraulic plunger for operating said injector, and measuring means synchronized with the motion ot said injector plunger to measuf out and supply measured charges oi.

molding material to `said injector. Y 8. An apparatus for treating heated materi comprising a machine having a plurality of material-treating chambers, a fluid container, iiuid compartments adjacent said chambers for exchanging heat therewith, means for circulating the uid from said container through said compartments, means for heating said iiuid, and means for by-passing a portion of the fluid past one of said 'compartments whereby to establish a temperature diilerential between said charn-v bers. v

9. An apparatus for treating heated materials comprising a machine having a plurality of maf terial-treating chambers, a uid container.' duid vcompartments adjacent said chambers for exchanging heat therewith, means for circulating tially constant temperature, in said iiuid contemer.

l0. An apparatus for treating heated materials comprising a machine having a plurality of material-treatingchambers, a iiuid container, fluid compartments adjacent said chambers for exchanging heat therewith, means for circulating the iiuid from said container through said compartments, means for heating said iluid, means for by-passing a portion of the duid past one of said compartments whereby to establish a temperature differential between said chambers, thermostatic means for maintaining a substantially constant temperature in said fluid container, and a valve in said by-passing means for controlling the proportionate quantity of iluid by-passed. Y

" ll. An injection molding press circuit comprising a plurality oi' dies, a,v hydraulic clamping plunger for said dies, a molding material injection member, an injection plunger therefor, and independent means for separately supplying pressure uid to said clamping plunger and said injection plunger, said last named means including mechanism for actuating said clamping die plunger at a higher pressure than said injection plunger. Y

. 12. An injection molding press circuit comprising a plurality of dies, a hydraulic clamping `plunger for said dies, a. molding material injection member,L an injection plunger therefor, a variable delivery pump for supplying pressure iluid to said clamping plunger, means responsive to the attainment cf a predetermined pressure in the clamping circuit for shiftingsaid pump to its neutral delivery position, a second Variable delivery pump for supplying pressure iluid to said injection plunger, and means responsive to the attainment of al predetermined pressure i the injection circuit for shifting said second pump to its neutral deliveryposition, said last named means including mechanism for actuating said clamping die plunger at a higher pressure than said injection plunger.

VICTOR S. SHAW.

DISCLAIMER 2,107,l90.-Victo'r S. Shaw, Cai'dington, Ohio. PLASTIC EXTRUSION MOLDING PRESS.

Patent dated February l, 1938.

Disclaimer led February 25,

1939, by the assignee, TherHydrauLc Press Corporation, Inc.; the patentee 'joining and concurring.

Hereby enters this disclaimer to claims l, 2, and 3 of said Letters Patent.

` {Ojcial Gazette March 21, 1939.] 

